Molding-machine.



A. BRAKE.

MOLDING MACHINE.

APPLICATION FILED JAN.3I. 1918.

Patented Oct. 8, 1918.

Aglllmulm port the different parts.

ABCI-IIBALD BRAKE, OF TORONTO, ONTARIO, CANADA.

MOLDING-MACHINE. 4 I 3 Specification of Letters Patent.-

Patented Oct. 8, 1918.

Application filed January 31, 1918. Serial No. 214,632.

' is a specification.

This invention relates to apparatus adapted particularly for making molds for such articles as cast metal pipes andthe like, and my object is to devise a machine which will reduce the hand labor in molding to a minimum, and which will produce a clean, compactly and evenly rammed mold.

I attain my object by means of the constructions hereinafter described and illustrated in the accompanying drawings in which- I V Figure l is a side elevation of my improved machine;-

Fig. 2 an end elevation of the same partly in section;

Fig. 3' a plan view of the same Fig. 1 an end elevation of part of the machine showing the sand hopper over the half flask- Fig. 5 an end elevation of the same parts illustrating th sweeping of the sand on the half flask;

Fig. 6 a sectional view of the same parts with the sand hopper entirely withdrawn and showing the sand compacting and retaining device just entering the half flask; and

Fig. 7 a plan view of the under side of the half flask and removed from the follower board and the pattern.

In the drawings like numerals of reference indicate corresponding parts'in' the different figures.

1 is a frame work suitably shaped to sup 7 On this frame work is carried the follower board 2. On the follower board is set a half pattern of the shape of theexterior contour of the pipe to be cast. This pattern is formed with a suitable core print at each end. A half flask 8 is adapted to sit on the follower board and to be detachably secured thereto by means of suitable latches 4. Any desirednumber of these half flasks may be employed with the machine. v

For each half flask there is provided a sand compacting and retaining device adapted to enter the half flask and 'to be releasably locked thereto. Each of these devices comp prises'an arched top or cover 5, preferably perforated as shown, to which are connected two longitudinally arranged compacting blades 6. To facilitate their entrance into the sand, these blades are preferably sharpened at their lower edges. Outwardly directedflanges 7 are also provided extending from the upper sides of the blades toward the sides of the half flask.

After a half flask has been filled and swept as hereinafter described, one of these compacting and retaining devices is forced down into the flask as shown particularly in Figs.

.2 and 6, and effectively compacts and presses the sandabout the pattern. Theblades 6 entering the sand between the sides of the pattern and the sidesof the half flask, firmly press the sand against the sides of the pattern, while the arched top compacts the sand radially inward against the curved upper p013 tion of the pattern.

Each half flask preferably isformed with a lateral extension 8 at one end adapted to contain sufficient'sand in which the gate may be formed required for the pouring of the mold. A sprue hole for the gate is formed by part ofthe apparatus whichwill be hereinafter described. I

To forcethe sand compacting devices into the half flasks, I provide one or more fluid pressure cylinders 9 suitably supported on the frame. To the pistons of these cylinders a presser head 10 is connected, which carries cross bars 11 adapted to engage the upper surface of the sand compacting device. The presser head is alSO provided with the transverse grooves 12 which fit over the cross bars 13 connected to 'theupper side of the sand compacting device.

These cross bars have jaws formed at-their ends to fit over the sides of the half flask, which jawsv areprovided with set screws 14:

' by means of which they may be clamped to the sides of the ,half flask to hold the sand compacting device in place. The grooves 12 prevent the, pressure of the head 10 coming on these cross bars 13.

The presser head carries a fluid pressure cylinder 15, the piston rod of which is shaped at its lower end to form a sprue hole forming tool 16. After the sand is properly compacted in the mold, the sprue hole forming tool is'operated to pierce a suitable hole in the sand in the extension 8.

To fill the half {flasks I provide a sand hopper 17. This sand hopper is connected to the piston rods of two fluid pressure cylinders 18, suitably supported on the frame.

This sand hopper is provided with a sliding bottom 19 adapted to be actuated by fluid pressure; cylinders 20, supported on the end of the sand hopper.

An approximately proper quantity of sand having been dropped in the sand hopper, the latter is moved to aposition over the half flask in position on the apparatus. In moving to this position, the sand hopper passes below a stationary sweeping blade 21 carried by arms 22 connected to the frame of the apparatus. This sweeping blade distributes the sandin the sand hopper and removes any surplus. When the sand hopper is in the position shown in Fig. 4, the

sliding bottom is moved to allow the sand 7 rise and fall. and to provide means for automatically raising and lowering the blade to give the desired result. I prefer to carry the sweeping blade on the spring arms 24 secured to the sand hopper. Rock arms 25 are pivotally connected to the sand hopper and are provided with projections 2'6,v preferably anti-friction rollers, adaptedto run over curved cam surfaces 27 carried by the sides of thehalf flasks. The ends of the rocking arms engage the sweeping blade 23 so as to rock the same and therefore cause its loweredge to rise and fall. This rising and falling is suitably timed so that the sweeping blade rises to its greatest height above the half flask when in the median plane of the latter, and thereafter gradually falls. to its normal position level with .the upper edge of the half flask. Each half flask, as soon as the sand therein issuitably compacted and the retaining device secured in place, is removed from the ma chine. The half flasks are then assembled in pairs with the core inserted and poured in the usual manner.

It will be found that with this device the sand is thoroughly compacted so that no hand ramming is needed and that theoperations can be carried out at a comparatively .high rate of speed. Suitable fluid supply pipes and controlling valves are, of course, provided for the fluid pressure: cylinders.

What -I claim as my invention is 1. In molding apparatus, the combination of a follower board having a pattern proi t ga QYe its pp ur cem np topped half flask removably supported on compact the sand between the half pattern and the sides of the half flask and an arched cover over the half pattern; and'relcasable means for locking said device to thehalf flask.

3. In molding apparatus, the combination of a follower board having a pattern projecting above its upper surface; an opentopped half flask removably supported on the follower board; a sand compacting and retaining device adapted to enter the half flask provided with longitudinally arranged compacting blades adapted to displace and compact the sand between the half pattern and the sides of the half flask and an arched cover over the half pattern and outwardly directed flanges extending from the upper sides of the blades toward the sides of the half flask; and releasable means for locking said device to the half flask.

4. In molding apparatus, the combination of a follower board having a pattern projecting above its upper surface; an opentopped half flask removably supported on the follower board; a sand compacting and retaining device adapted to enter the half flask provided with longitudinally arranged compacting blades adapted to displace and compact the sand between the. half pattern and the sides of the half flask and a perforated arched cover over the half pattern; and releasable means for locking said. device to the half flask.

5. In molding apparatus, the combination of a follower board having a pattern projecting above its upper surface; an opentopped half flask removably supported on the follower board; a sand compacting and retaining device adapted to enter the .half flask; releasable means for lockin said'device to the half flask; a frame with which the follower board is connected; a presser head located above the half flask adapted to actuate the sand compacting and retaining device; and fluid pressure apparatus for actuating the presser head. 7 Q 6. In molding apparatus, the combination of a follower board having a pattern pro- .jected above its upper surface; an opentopped half flask removably supported on the followerboard; a sand compacting and retaining device adapted to enter the half flask; releasable means for locking said device to the half flask; a frame with which the follower board is connected; a presser head located above the half flask adapted to actuate the same compacting and retaining device; fluid pressure apparatus for actuating the presser head; a sprue hole former; and fluid pressure apparatus carried by the presser head for actuating said sprue hole former.

7. In molding apparatus, the combination of a followerboard; a pattern projecting above its upper surface; an open topped half flask removably supported on the follower board; a sand hopper movable to and from a position over the half flask; a sliding bottom for said hopper; a stationary sweeping blade adapted to level the sand in the hopper as the latter is moved to a position over the half flask; and a sweeping blade adapted as the hopper is moved away to sweep the sand deposited in the half flask.

S. In molding apparatus, the combination of a follower board; a pattern projecting above its upper surface; an open topped half flask removably supported on the follower board; a sand hopper movable to and from a position over the half flask; a sliding bottom for said hopper; a stationary sweeping blade adapted to level the sand in the hopper as the latter is moved to a position over the half flask; and a resiliently supported sweeping blade adapted as the hop per is moved away to sweep the sand deposited in the half flask.

9. In molding apparatus, the combination of a follower board; a pattern projecting above its upper surface; an open topped half flask removably supported on the follower board; a sand hopper movable to and from a position over the half flask; a sliding bottom for said hopper; a stationary sweeping blade adapted to level the sand in the hopper as the latter is moved to a position over the half flask; a resiliently supported sweeping blade adapted as the hopper is moved away to sweep the sand deposited in the half flask; and means for automatically raising and lowering the last mentioned sweeping blade to give greater depth of sand along the median plane of the half flask.

10. In molding apparatus, the combination of a follower board; a pattern projecting above its upper surface; an open topped half flask removably supported on the follower board; a sand hopper movable to and from a position over the half flask; a sliding bottom for said hopper; a stationary sweeping blade adapted to level the sand in the hopper as the latter is moved to a position over the half flask; a movably supported sweeping blade adapted as the hopper is moved away to sweep the sand deposited in the half flask; and means for automatically raising and lowering the last mentioned sweeping blade to give greater depth of sand along the median plane of the half flask.

Signed at Toronto, Canada, this 22nd day of January 1918.

ARCHIBALD BRAKE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Yatents, Washington, D. 0. 

